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Whitney- developed the simplified stress block

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Dr. N. Subramanian
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PostPosted: Sun Apr 22, 2012 5:39 pm    Post subject: Whitney- developed the simplified stress block Reply with quote

Charles S. Whitney (1892 to 1959)

After graduating from Cornell University in 1915, Charles Whitney founded a successful consulting engineering practice in Milwaukee, WI. Services were provided in the planning, design and construction supervision of structures and municipal projects including bridges, highways, buildings and special structures. Whitney was well known for the development of the plastic theory and ultimate strength methods of reinforced concrete design, and long-span, thin-shell structures.

He was the author of many engineering-related books and articles and was particularly active with the American Concrete Institute throughout his career, serving as its President in 1955. Whitney contributed numerous technical papers to advance the design of concrete structures. The Whitney Stress Block, a cornerstone of American concrete design since its adoption in 1956, was named after Charles Whitney. This simplified stress block simplified the calculations considerably without much loss of accuracy. Hence this brilliant idea has been adopted not only in ACI Code but in several other National codes.

Whitney’s research and papers contributed to the ACI Standards now titled “The Manual of Concrete Practice.” Charles Whitney authored “Bridges of the World: Their Design and Construction” and “Bridges: Their Art, Science and Evolution,” both published in 1929.

Ammann & Whitney…in Partnership
Othmar Ammann and Charles Whitney’s paths first crossed in 1914 when they both worked on the Hell Gate Bridge with Gustav Lindenthal. By 1946, when they joined forces, both were operating successful consulting engineering practices and had well-established reputations in their areas of expertise.

Ammann, already renowned for his engineering design excellence in long-span suspension bridges, led the firm’s engineering efforts on the Throgs Neck and Verrazano Narrows Bridges and also designed the Walt Whitman Bridge and Wards Island Vertical Lift Bridge. He remained an active partner of the firm until his death.

Since then, Ammann & Whitney has continued to provide inspection and rehabilitation design services on the Ammann-designed bridges as well as many others. Whitney led the firm’s building, special structures and overseas practices. He established the firm’s practice in blast resistant structures and military/federal work and directed studies of blast resistant structures for the US Army and Federal Civil Defense Administration, and co-authored “Design of Blast Resistant Construction for Atomic Explosions” receiving ACI’s award for most meritorious paper. Whitney continued his research and development of concrete structures, including unique thin-shell structures such as the American Airlines hangar at Chicago’s Midway Airport. He remained an active partner leading many of the firm’s building projects until his death.

The firm has won numerous awards and has been consistently recognized for technical innovation, integrity and achievement, along with an unwavering commitment to client satisfaction. Ammann & Whitney is privileged to have been associated with the design and/or upgrade of many of our nation’s most notable landmarks, including the Verrazano Narrows, George Washington and Golden Gate Bridges; the Statue of Liberty; the US Capitol Building; Lincoln Center; the Washington, DC Metro; Dulles International Airport; and the Jet Blue Terminal at JFK Airport

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